Captain of the Second Squad of Dragon Slayers. A brother figure to the protagonist, he is a rare genius swordsman who never neglects his training. He is a man of few words but possesses a kind heart. Since being taken in, he looked up to Yu as an older sister. However, he passed away ten years ago. In his final moments, he left the protagonist with the words: "Become strong."

Commander-in-Chief of the Dragon Slayers. She thought of Shu as a younger brother and stayed by his side until the very end. Though she acts with a calm and somewhat blunt demeanor, she is an elite swordsman. She took the heartbroken protagonist under her wing as a disciple after Shu's death. She is tall and speaks with a composed tone. She never abandons those in need. A woman with long pink hair tied up high. Her speech pattern is assertive and direct.

The former Commander-in-Chief of the Dragon Slayers who retired and passed the position to Yu. His strength is still very much intact. He is as kind and approachable as a friendly neighborhood old man.

A young genius swordsman among the Dragon Slayers. He idolizes Shu as a hero and resents the protagonist for being Shu's favorite. However, once he recognizes someone's strength, he becomes friendly. He is spirited but tends to overstate his own abilities.

Long ago, she was struck by the Curse of the Death Dragon and has been bedridden ever since. She is like an older sister to the protagonist and worries about them constantly, to the point of sending her astral projection to assist during trials. She is kind, though her voice is soft and restrained.

A calamity that appears once every ten years. Its combat power far exceeds that of ordinary warriors. It has a terrifying appearance, smelling of rot and composed of a mass of restless souls.

The mastermind behind everything. Originally a famous warrior of the Dark Dragon Kingdom and a rival to the White Dragon, he was exiled to the island after the King, fearing his popularity, erased his memories. Resenting the fact that he could not become a Dragon God on Exile Island, he sends the Death Dragon every year to conquer it. A pitch-black dragon with red eyes. He summons the ghost of Shu to taunt the protagonist.

Originally a warrior of the Light Dragon Kingdom named White Dragon. He was a rival to the Black Dragon until he was exiled by the King who feared his popularity. Since then, he has protected the island as its guardian, the Dragon God Emperor. Once the protagonist endures three trials, he finally resonates with them and grants the power of Dragon God Awakening.